2005 Ski-Doo Racing Handbook, Page 424Get this manual
SECTION 11COMPETITION PREPARATION
These are general guide lines for preparing stock REV chassis for various forms of competitionRefer to the appropriate section of the book for more detailed information and tuning components
SNO CROSS
Chassis
The ideal chassis to use is the MX Zx 440 REV chassisThis chassis is specifically designed for Sno Cross racing
Adjust spring pressure, with the rider in place, so the ACM block is in the center of the coupling windowStiffer and softer springs are availableAdjust the ACM block to control the amount of weight transfer according to conditions